Campaigners are challenging the plan, which would allow 55 liners to moor on the Thames every year.
By bringing emissions down to the Paris climate talk target, the U.S. will improve air pollution to the point that it could save hundreds of thousands of lives
More than half of those deaths occur in China and India, according to research.
The announcement marks the first red alert in the city's history.
A new study from MIT found that the excess pollution will kill about 60 Americans prematurely.
The agency's scientists warned against setting the limit at this level.
Breathing air clean enough to meet the EPA's standards raises one's risk of heart disease death by 12 percent, according to a new study.
The project will pilot in San Francisco before it rolls out country-wide.
Babies were born 23 grams heavier during Beijing's fresh air Olympics period.
Chinese capital will close last major coal plant next year in bid to avert economic costs of pollution.
Almost 3,000 fines handed out as French capital seeks to tackle dangerous levels of particulate matter.
Ozone is linked to asthma, heart disease, premature death, and an array of pregnancy complications